MDB1900ZCQZ-TR

Overview

The MDB1900ZCQZ-TR is a zero-delay clock buffer manufactured by Microchip Technology, originally designed by Micrel. It features a fully integrated programmable PLL and distributes reference clocks for PCIe (Gen1/2/3), SATA, SAS, ESI, SMI, and Intel QPI. The device accepts a single differential HCSL input and provides nineteen differential HCSL-compatible outputs with a 1:19 ratio. It operates on a supply voltage of 2.375V to 3.465V within an ambient temperature range of 0°C to +70°C. Key electrical specifications include cycle-to-cycle jitter under 35ps in PLL mode, output-to-output skew under 35ps, and a fixed 0ps input-to-output delay variation.

Feature Summary

• Integrated high-performance PLL supporting zero-delay (0ps) buffer mode at 100MHz and 133.33MHz
• Nineteen differential HCSL-compatible clock output pairs with selectable bandwidth modes
• SMBus interface for software control of output enable/disable and delay tuning
• Spread spectrum modulation tolerant for EMI reduction

Applications

• PCI Express timing (Gen1/2/3) in Intel platforms
• SATA/SAS storage timing systems
• Intel Quickpath Interconnect (QPI)
• ESI and SMI systems

Procurement Notes

Verify the component origin as the MDB1900ZC was originally developed by Micrel before acquisition by Microchip Technology. Confirm that the 'QZ' suffix corresponds to the commercial temperature grade (0°C to +70°C) and tape-and-reel shipping format. Ensure compatibility with existing PCB layouts requiring the 72-pin 10mm x 10mm QFN package.

Selection Notes

Select this component when a true zero-delay buffer with internal feedback is required to eliminate external PCB routing for the feedback path. It is suitable for designs needing nineteen differential outputs from a single HCSL source. Consider the SMBus addressability if multiple devices share the same bus segment. Verify power supply constraints align with the 2.5V or 3.3V operating ranges.

Part Context

This part belongs to the MDB1900Z series of zero-delay buffers. The MDB1900ZC variant specifically targets Intel DB1900Z specification compliance while integrating the feedback loop internally. It serves as a critical timing distribution element in complex server and storage architectures requiring low-jitter clock synchronization across multiple agents.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.